windows password for 2000

I was setting up a home network for several machines behind a multiport router with various types of operating systems (NT, 2000, 95) On the 2000 maching I was attempting to get it and the NT machine to see each other and share files. I changed its domain to match that of the NT machine. After rebooting it would not recognize me as a user and I am unable to boot.

What is the best solution to get back in….

signed….locked out of seattle